Java SE实现多人聊天室功能
这篇文章主要为大家详细介绍了Java SE实现多人聊天室功能，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下本文实例为大家分享了java se实现多人聊天室功能的具体代码，供大家参考，具体内容如下
实现功能：
1.实现用户注册上线，下线
2.实现群聊和私聊功能
3.实现统计当前在线人数
实现思路：
1.首先，要实现服务端与客户端之间的连接
这里是使用套接字建立tcp连接：
（1）服务器端先实例化一个描述服务器端口号的serversocket对象
（2）客户端要创建socket对象来连接指定的服务器端
（3）服务器端调用serversocket类的accept()方法来监听连接到服务器端的客户端信息
（4）若服务器端与客户端连接成功，双方将返回一个socket对象，此时双方可以进行通信
（5）服务器端与客户端使用i/o流进行连接，服务端的输出流连接客户端的输入流，客户端的输出流连接服务端的输入流
（6）使用close()方法关闭套接字（一定要记得关闭）
2.因为是拥有一个服务端来实现多个客户端的连接，此处还要解决的是多线程的问题。
每个客户端需要两个线程，来分别处理向服务端发送消息和向服务端接收消息
而服务端，当每增加一个客户端与服务端连接，服务端都要多创建一个线程来处理与客户端的连接
具体代码：
单线程实现：
客户端
import java.io.ioexception;
import java.io.printstream;
import java.net.socket;
import java.util.scanner;
/**
* @author lxy
* @email 403824215@qq.com
* @date 2018/7/20 15:46
*/
//客户端
public class singleclient {
public static void main(string[] args) throws ioexception {
//客户端连接服务器，返回套接字socket对象
socket socket = new socket("127.0.0.1",6666);
//获取服务端的输出流，向服务器端输出内容
printstream printstream = new printstream(socket.getoutputstream());
printstream.println("我是客户端" + socket.getlocalport());
//获取服务器端的输入流，读取服务器端的内容
scanner scanner = new scanner(socket.getinputstream());
scanner.usedelimiter("\n");
if(scanner.hasnext())
{
system.out.println(scanner.next());
}
//关闭流
socket.close();
}
}
服务端
import java.io.ioexception;
import java.io.printstream;
import java.net.serversocket;
import java.net.socket;
import java.util.scanner;
/**
* @author lxy
* @email 403824215@qq.com
* @date 2018/7/20 15:34
*/
//服务端
public class singleserver {
public static void main(string[] args) throws ioexception {
//创建服务器端的serversocket对象，等待客户端进行连接
serversocket serversocket = new serversocket(6666);
system.out.println("服务器的端口号为6666，等待客户端连接。。。");
//侦听并接收服务器端的连接，返回套接字socket对象
socket socket = serversocket.accept();
//获取客户端的输入流，读取客户端的输入内容
scanner scanner = new scanner(socket.getinputstream());
scanner.usedelimiter("\n");
if(scanner.hasnext())
{
system.out.println("客户端发来消息：" + scanner.next());
}
//获取客户端的输出流，向客户端输出内容
printstream printstream = new printstream(socket.getoutputstream());
printstream.println("客户端你好，我是服务器端：" + serversocket.getlocalport());
//关闭流
serversocket.close();
}
}
多线程实现
客户端
import java.io.ioexception;
import java.io.printstream;
import java.net.socket;
import java.util.scanner;
/**
* @author lxy
* @email 403824215@qq.com
* @date 2018/7/20 15:55
*/
//客户端
//客户端读取服务器端信息的线程
class clientreadserver implements runnable
{
private socket socket;
public clientreadserver(socket socket)
{
this.socket = socket;
}
public void run() {
try {
scanner scanner = new scanner(socket.getinputstream());
while (scanner.hasnext())
{
system.out.println(scanner.next());
}
socket.close();
} catch (ioexception e) {
e.printstacktrace();
}
}
}
//客户端向服务端发送信息的线程
class clientsendserver implements runnable
{
private socket socket;
public clientsendserver(socket socket)
{
this.socket = socket;
}
public void run() {
try {
printstream printstream = new printstream(socket.getoutputstream());
scanner scanner = new scanner(system.in);
while (true)
{
string msg = null;
if(scanner.hasnext())
{
msg = scanner.next();
printstream.println(msg);
}
if(msg.equals("bye"))
{
scanner.close();
printstream.close();
break;
}
}
} catch (ioexception e) {
e.printstacktrace();
}
}
}
public class multiclient {
public static void main(string[] args) throws ioexception {
socket socket = new socket("127.0.0.1",6666);
thread read = new thread(new clientreadserver(socket));
thread send = new thread(new clientsendserver(socket));
read.start();
send.start();
}
}
服务端
import java.io.ioexception;
import java.io.printstream;
import java.net.serversocket;
import java.net.socket;
import java.util.map;
import java.util.scanner;
import java.util.set;
import java.util.concurrent.concurrenthashmap;
import java.util.concurrent.executorservice;
import java.util.concurrent.executors;
import java.util.regex.matcher;
import java.util.regex.pattern;
/**
* @author lxy
* @email 403824215@qq.com
* @date 2018/7/20 16:12
*/
class server implements runnable
{
private static map<string,socket> map = new concurrenthashmap<string, socket>();
private socket socket;
public server(socket socket)
{
this.socket = socket;
}
public void run() {
try {
scanner scanner = new scanner(socket.getinputstream());
string msg = null;
while (true)
{
if(scanner.hasnextline())
{
msg = scanner.nextline();
pattern pattern = pattern.compile("\r");
matcher matcher = pattern.matcher(msg);
msg = matcher.replaceall("");
//用户注册——格式：username:用户名
if(msg.startswith("username:"))
{
string username = msg.split("\\:");
userregist(username,socket);
continue;
}
//群聊——格式：g:群聊信息
else if(msg.startswith("g:"))
{
firststep(socket);
string str = msg.split("\\:");
groupchat(socket,str);
continue;
}
else if(msg.startswith("p:") && msg.contains("-"))
{
firststep(socket);
string username = msg.split("\\:").split("-");
string str = msg.split("\\:").split("-");
privatechat(socket,username,str);
continue;
}
else if(msg.contains("bye"))
{
firststep(socket);
userexit(socket);
continue;
}
else
{
printstream printstream = new printstream(socket.getoutputstream());
printstream.println("格式输入错误");
continue;
}
}
}
} catch (ioexception e) {
e.printstacktrace();
}
}
private void firststep(socket socket) throws ioexception {
set<map.entry<string,socket>> set = map.entryset();
for(map.entry<string,socket> entry:set)
{
if(entry.getvalue().equals(socket))
{
if(entry.getvalue() == null)
{
printstream printstream = new printstream(socket.getoutputstream());
printstream.println("请先进行注册操作！格式为：");
}
}
}
}
private void userregist(string username, socket socket) {
map.put(username,socket);
system.out.println("用户名：" + username + "客户端" + socket +"上线了！！");
system.out.println("当前在线人数为" + map.size() + "人");
}
private void groupchat(socket socket, string msg) throws ioexception {
set<map.entry<string,socket>> set = map.entryset();
string username = null;
for(map.entry<string,socket> entry:set)
{
if(entry.getvalue().equals(socket))
{
username = entry.getkey();
break;
}
}
for(map.entry<string,socket> entry:set)
{
socket client = entry.getvalue();
printstream printstream = new printstream(client.getoutputstream());
printstream.println(username + "说" + msg);
}
}
private void privatechat(socket socket, string username, string msg) throws ioexception {
string curuser = null;
set<map.entry<string,socket>> set = map.entryset();
for(map.entry<string,socket> entry:set)
{
if(entry.getvalue().equals(socket))
{
curuser = entry.getkey();
break;
}
}
socket client = map.get(username);
printstream printstream = new printstream(client.getoutputstream());
printstream.println(curuser + "私聊说" + msg);
}
private void userexit(socket socket) {
string username = null;
for(string key:map.keyset())
{
if(map.get(key).equals(socket))
{
username = key;
break;
}
}
map.remove(username,socket);
system.out.println("用户" + username + "已下线");
}
}
public class multiserver {
public static void main(string[] args) {
try {
serversocket serversocket = new serversocket(6666);
//使用线程池
executorservice executorservice = executors.newfixedthreadpool(20);
for(int i = 0;i < 20;i++)
{
system.out.println("欢迎来到聊天室。。。");
socket socket = serversocket.accept();
system.out.println("新人加入。。。");
executorservice.execute(new server(socket));
}
executorservice.shutdown();
serversocket.close();
} catch (ioexception e) {
e.printstacktrace();
}
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持CodeAE代码之家。
原文链接：https://blog.csdn.net/L_X_Y_HH/article/details/80633819
http://www.zzvips.com/article/174836.html
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